Graco PRO 3500WB, Manual

Page: 32 / 48

CONVERTING PRO 3500SC GUN TO PRO 3500WB GUN
NOTE: See page 41 to order Conversion Kit 223–114. The fluid hose and air hose are not included with this kit. See
pages 40 and 42 to order hoses. Use ONLY the electrically conductive air supply hose specified in this manual. A
larger fluid nozzle may be required for some water-base paints. See Manual 307–803 for available fluid nozzles.
Fig 30
A
B
KEY
A Fluid Seal
B Fluid Tube Fitting
C Gun Fitting Bracket
D Air Fitting
E Exhaust Tube
F Exhaust Tube Clamp
G Retaining Nut
H Nozzle/Resistor
Stud Assembly
J Needle/Electrode
K Fluid Needle Assembly
L Trigger Screws
M Trigger
P Air Cap
Q Ferrules
R Nut
E
F
D
C
G
H
J
K
L
M
R
Q
P
PRO 3500SC Gun Disassembly
1. Remove the fluid tube fitting (B) and fluid seal (A)
from the gun. See Fig 30.
2. Remove the air fitting (D), exhaust tube clamp (F),
and the exhaust tube (E).
Keep these parts and the
nut (R) and ferrules (Q) for reassembly .
3. Remove the gun fitting bracket (C) with the hose
assembly.
4. Remove the retaining nut (G).
NOTE: Keep all the following parts for reassembly .
5. Remove the air cap (P). Point the front end of the gun
up and squeeze the trigger while removing the fluid
nozzle/resistor stud assembly (H).
CAUTION
BE SURE to hold the front end of the gun up while
removing the nozzle and resistor stud to prevent
any paint or solvent left in the gun from entering
the air passages.
NOTE: If the resistor stud remains in the gun when the
fluid nozzle is removed, start the nozzle thread
onto the stud and pull the stud out.
6. Unscrew and remove the fluid needle/electrode (J)
with the electrode tool supplied with the gun. If the
needle shaft turns, hold the needle shaft assembly
by placing a screw driver blade into the slot on the
shaft, near the trigger.
CAUTION
Be careful not to damage the contact wire when
removing electrode from the gun.
7. Loosen the trigger screws (L) far enough to remove
the trigger (M).
8. Remove the packing cartridge and needle assembly
(K) with the 9 mm hex nut driver supplied with the
gun.
Installing the Fluid Needle Assembly
1. Before installing the new fluid needle assembly (28*)
into the gun barrel, make sure the internal surfaces of
the barrel are clean. Remove any residue with a soft
brush or cloth.
2. Lubricate the o-ring on the outside of the fluid needle
packing housing.
3. Install the fluid needle assembly (28) into the gun
barrel. See Fig 7. Using the 9 mm hex nut driver,
tighten the assembly until just snug, then check the
drag on the needle. (Make sure the spring is installed
on the fluid needle nut.)
4. Install the trigger (L) and tighten the trigger
screws (K).
5. Install the electrode (20) finger tight. DO NOT over
tighten.
CAUTION
To avoid damaging the plastic threads or contact
wire, be very careful when installing the elec-
trode.